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Standards for national standard steel pipes: 1. Seamless steel pipes for structural use: GB8162-2008; 2. Seamed steel pipes for fluid transport: GB8163-2008; 3. Seamless steel pipes for boilers: GB3087-2008; 4. High-pressure seamless pipes for boilers: GB5310-2008 (ST45.8-Ⅲ type); 5. High-pressure seamless pipes for fertilizer production equipment: GB6479-1999; 6. Seamless steel pipes for geological drilling: YB235-70; 7. Seamless steel pipes for oil drilling: YB528-65; 8. Seamless steel pipes for oil cracking: GB9948-88; 9. Special seamless pipes for oil drill collars: YB691-70; 10. Seamless steel pipes for automobile half-shafts: GB3088-1999; 11. Seamless steel pipes for ships: GB5312-1999; 12. Precision seamless steel pipes produced by cold drawing or cold rolling: GB3639-1999. In addition, there are also GB/T17396-1998 (hot-rolled seamless pipes for hydraulic props), GB3093-1986 (high-pressure seamless pipes for diesel engines), GB/T3639-1983 (precision seamless pipes produced by cold drawing or cold rolling), GB/T3094-1986 (special-shaped seamless pipes produced by cold drawing), GB/T8713-1988 (precision inner-diameter seamless pipes for hydraulic and pneumatic cylinders), GB13296-1991 (stainless steel seamless pipes for boilers and heat exchangers), GB/T14975-1994 (stainless steel seamless pipes for structural use), GB/T14976-1994 (stainless steel seamless pipes for fluid transport), GB/T5035-1993 (seamless pipes for automobile half-shaft sleeves), API SPEC5CT-1999 (specifications for casings and tubing), etc.